STABILIZED PYROPHORIC MATERIALS FOR ONBOARD HYDROGEN GENERATION BY HYDROLYSIS AND RELATED METHODS
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United States of America Patent
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Sep 5, 2024
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Jul 15, 2022
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Jul 28, 2021
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Hydrolysis of water-reactive nanoporous nonprecious metals to produce hydrogen fuel on-demand for non-stationary applications is a promising method to overcome infrastructural limitations associated with current hydrogen storage and delivery systems. However, the pyrophoricity of highly reactive nanoporous nonprecious metals presents a safety and stability issue. Herein we demonstrate a method to stabilize pyrophoric nanoporous nonprecious metals by using a composite pellet structure consisting of a nanoporous nonprecious metal and a highly hygroscopic material that (i) can trap and absorb high quantities of water vapor to prevent heat buildup and subsequent pyrophoric ignition from exothermic oxidation from oxygen, and (ii) can also undergo hydrolysis to produce hydrogen, thus, making it possible to suppress the pyrophoricity without sacrificing the overall hydrogen generation yield of the composite. Lithium hydroxide and lithium borohydride were investigated as two candidate hygroscopic materials for their ability to absorb water vapor.
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